<div class="container"></div>

<style>
/* From Uiverse.io by Juanes200122  - Tags: simple, html, css, pattern */
.container {
  position: absolute;
  width: 100%;
  height: 100%;
  perspective: 1000px;
  background: linear-gradient(45deg, #000000 25%, transparent 25%),
    linear-gradient(
      -135deg,
      #000000 25%,
      transparent 25%,
      transparent 75%,
      #000000 75%,
      #000000
    );
  background-size: 50px 50px;
}

</style>
    